"Faceshield headgear features lightweight and heat-resistant Noryl« (the same material used in welding helmets) crown protectors and ratchet headbands. (Windows sold separately.) Meet ANSI Z87.1-2003 High Impact.F-300 lightweight faceshield headgear provides general face protection for light-duty applications. Easily fits over spectacles, leaving room for air circulation to prevent fogging. Accommodates standard size (8"" x 11 1/2"") windows.F-400 features a deeper 4"" crown protector to extend protection without increasing weight. Incorporates wide-vision (8"" x 17"") wraparound windows and screens which provide 40% more protective area than standard size faceshields. Fits easily over required spectacles or respirators. F-500 includes a broader, deeper 7"" crown protector to provide an extra margin of protection when harsh working conditions require it. Features the exclusive Channel Grip system that mounts wide, wraparound windows and locks them into place to form a perfect seal from dust, dirt and debris. Includes Fibre-Metal« classic 3-C, free-floating headgear."